Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 5 years ago
Bismihi ta'ala
Yes, a brother's ex-wife's nephew is a non-mahram and she can marry him as long as all the other conditions and requirements are met.
Of course, it would be a good idea to consult with her brother, and other family members to see firstly whether he is a good suitor, being religious and having high moral standards, and secondly if the issues they had that made their marriage fall apart will affect her relationship with the brother's ex-wife's nephew.
With prayers for your success.